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TMK316BJ106ML Datasheet(PDF) 9 Page - Richtek Technology Corporation

Part # TMK316BJ106ML
Description  2A, 23V, 1.2MHz Synchronous Step-Down Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

TMK316BJ106ML Datasheet(HTML) 9 Page - Richtek Technology Corporation

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RT8292B
9
DS8292B-03
March 2011
www.richtek.com
Application Information
The RT8292B is a synchronous high voltage buck converter
that can support the input voltage range from 4.5V to 23V
and the output current can be up to 2A.
Output Voltage Setting
The resistive voltage divider allows the FB pin to sense
the output voltage as shown in Figure 1.
Figure 1. Output Voltage Setting
The output voltage is set by an external resistive voltage
divider according to the following equation :

+


OUT
FB
R1
V
= V1
R2
where VFB is the feedback reference voltage (0.8V typ.).
External Bootstrap Diode
Connect a 100nF low ESR ceramic capacitor between
the BOOT pin and SW pin. This capacitor provides the
gate driver voltage for the high side MOSFET.
It is recommended to add an external bootstrap diode
between an external 5V and BOOT pin for efficiency
improvement when input voltage is lower than 5.5V or duty
ratio is higher than 65% .The bootstrap diode can be a
low cost one such as IN4148 or BAT54. The external 5V
can be a 5V fixed input from system or a 5V output of the
RT8292B. Note that the external boot voltage must be
lower than 5.5V.
Figure 2. External Bootstrap Diode
Soft-Start
The RT8292B contains an external soft-start clamp that
gradually raises the output voltage. The soft-start timing
can be programmed by the external capacitor between
SS pin and GND. The chip provides a 6
µA charge current
for the external capacitor. If 0.1
µF capacitor is used to set
the soft-start, the period will be 13.5ms (typ.).
Chip Enable Operation
The EN pin is the chip enable input. Pulling the EN pin
low (<0.4V) will shut down the device. During shutdown
mode, the RT8292B quiescent current will drops below
3
µA. Driving the EN pin high (>2.7V, < 5.5V) will turn on
the device again. For external timing control (e.g.RC),
the EN pin can also be externally pulled high by adding a
REN* resistor and CEN* capacitor from the VIN pin
(see Figure 5).
An external MOSFET can be added to implement digital
control on the EN pin when no system voltage above 2.5V
is available, as shown in Figure 3. In this case, a 100k
pull-up resistor, REN, is connected between VIN and the
EN pin. MOSFET Q1 will be under logic control to pull
down the EN pin.
Figure 3. Enable Control Circuit for Logic Control with
Low Voltage
To prevent enabling circuit when VIN is smaller than the
VOUT target value, a resistive voltage divider can be placed
between the input voltage and ground and connected to
the EN pin to adjust IC lockout threshold, as shown in
Figure 4. For example, if an 8V output voltage is regulated
from a 12V input voltage, the resistor, REN2, can be
selected to set input lockout threshold larger than 8V.
RT8292B
GND
FB
R1
R2
VOUT
SW
BOOT
5V
RT8292B
100nF
VIN
EN
GND
BOOT
FB
SW
7
5
2
3
1
L
R1
R2
VOUT
Chip Enable
VIN
RT8292B
SS
8
CSS
COMP
CC
RC
CP
6
4,
9 (Exposed Pad)
CBOOT
COUT
CIN
REN
Q1
100k


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